Answer: A) Radio waves Explanation: Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies.  Ultraviolet Light (UV). part of the electromagnetic spectrum that consists of waves with frequencies higher than those of visible light and lower than those of x-rays.

Answer: B) Cell biology Explanation: The branch of biology that studies the different structures and functions of the cell is called Cell Biology or Cytology.    A cell is the smallest unit of life that can replicate independently, and cells are often called the "building blocks of life"    Cell Biology deals with : Life cycle  Structure and organisation of cell organelles and their physiological properties.  Metabolic processes  Interactions with their environment  Signalling pathways.